.node-list{
  margin-top:10px;
}
.node{
  display:inline-block;
}
.node span{
  display:inline-block;
  border:1px solid #ccc;
  border-radius:100%;
  padding:8px;
  transition:1s all;
}
.node:before{
  content:'';
  display:inline-block;
  width:50px;
  height:0px;
  margin-bottom:4px;
  line-height:1px;
  border:1px solid #333;
  border-width:1px  0 0;
}
.zoom{
  transform:scale(2)
}
